Product Name: Hex Head Self Drilling Screw /Roofing Screws Model NO.: 8#, 10#, 12#, 14# Grade: 4.8 Standard: DIN Head Style: Hexagonal Connection: Common Bolt Groove: Hexagon Type: Hexagon Head Material: Carbon Steel Transport Package: Carton/Pallets Origin: China Prc HS Code: 7318159001 Product Description C1022 IND.HEX WASHER HEAD (A/F 3/8 )SELF DRILLING SCREWS WITH STEEL/RUBBER WASHER Z/P